function test(person) {
    person.age = 26
    person = {
      name: 'hzj',
      age: 18
    }
    return person
  }
  const p1 = {
    name: 'fyq',
    age: 19
  }
  const p2 = test(p1)
  console.log(p1) // -> 
  console.log(p2) // -> ?